Studder when supercharger kicks in

3620 Views 25 Replies 13 Participants Last post by Indyblue98, Apr 25, 2009

VforVictory

Discussion Starter · Mar 27, 2009

I currently have the D3 Stage 1.5 upgrade = ECU Box, stage 1&2 intake and Corsa Exhaust System. Recently I had a front end oil leak which cadillac fixed, since then I have noticed that when im accelerating between gears 1-2 there is a studder when the supercharger kicks in. When coming off the line and fully accelerating the supercharger will engage but then as if it hit some type of rev limiter it studders repeatedly and the supercharger disengages totally. I was hoping anyone knew if this is to do with maybe the D3 ECU Box or cadillacs doing?

*Oddly this only occurs off the line or when the car is rolling slowly between 1st & 2nd.

1 - 20 of 26 Posts

Florian

· #2 · Mar 27, 2009

your supercharger cannot 'disengage'...its driven off the crank pulley. You got other issues.

F

Bee iLL

· #3 · Mar 27, 2009

If you are concerned it is being caused by the D3 box, just unplug it. If the problem stops, you know it is the box.

Indyblue98

· #4 · Mar 27, 2009

VforVictory said:
there is a studder when the supercharger kicks in. When coming off the line and fully accelerating the supercharger will engage but then as if it hit some type of rev limiter it studders repeatedly and the supercharger disengages totally. I was hoping anyone knew if this is to do with maybe the D3 ECU Box or cadillacs doing?

*Oddly this only occurs off the line or when the car is rolling slowly between 1st & 2nd.

The car does have a rev limiter, are you shifting manually close to redline?
I know on mine the delay seems like several hundred rpm after I move the shifter, if i wait till close to redline before shifting it will hit the limiter.:banghead:
If you mean as it goes into 2nd , maybe iyour spinning tires on the gear change.
Have you tried turning off traction control?

CIWS

· #5 · Mar 27, 2009

Just another chime in, you'll need to remove any mods to check and see if the car is doing it stock. If it is not, then something is up with the mod(s) on the car. If it is doing it without the mods you'll almost certainly need to take it to the dealership and have them have another look at it anyway in a stock configuration. (that way they can't blame the issue on your added mods)

Last year they had to work on mine to fix a lower crankcase oil leak and ended up fooking something up on the supercharger causing me to bleed boost pressure early resulting in a loss of about 50rwhp. It took me proving the car was different/less to get them to seriously go back in and find/fix what they did. Luckily I had several dyno runs done on the car after it was purchased, so I could prove there was a definite loss of HP vs their butt dynos which told them the car was fine. (my butt dyno told me it wasn't). They did find and fix what they did the first time.

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Jpjr

· #6 · Mar 27, 2009

codes?

WillySTS

· #7 · Mar 27, 2009

VforVictory said:
it studders repeatedly and the supercharger disengages totally. I was hoping anyone knew if this is to do with maybe the D3 ECU Box or cadillacs doing?

*Oddly this only occurs off the line or when the car is rolling slowly between 1st & 2nd.

When my car does this, I know that it is wheel spin with the associated wheel hop...usually ocurrs at the top of 1st gear when it is trying to hook up.

PSRmark

· #8 · Mar 30, 2009

CIWS said:
Just another chime in, you'll need to remove any mods to check and see if the car is doing it stock. If it is not, then something is up with the mod(s) on the car. If it is doing it without the mods you'll almost certainly need to take it to the dealership and have them have another look at it anyway in a stock configuration. (that way they can't blame the issue on your added mods)

Last year they had to work on mine to fix a lower crankcase oil leak and ended up fooking something up on the supercharger causing me to bleed boost pressure early resulting in a loss of about 50rwhp. It took me proving the car was different/less to get them to seriously go back in and find/fix what they did. Luckily I had several dyno runs done on the car after it was purchased, so I could prove there was a definite loss of HP vs their butt dynos which told them the car was fine. (my butt dyno told me it wasn't). They did find and fix what they did the first time.

I remember that. The dealership didn't use the proper J-tools to support the supercharger right? In any case we have been talking back and forth with Paul, we are waiting to hear how the vehicle responds to removal of the ECU box. It really does sound similar to what you experienced though.

CIWS

· #9 · Mar 31, 2009

d3Mark said:
I remember that. The dealership didn't use the proper J-tools to support the supercharger right?

Yeah it was that incident. Thanks to your explanation and pictures they figured out what they did and got it fixed.

JIMMER06STSV

· #10 · Mar 31, 2009

I am having the same issue now. Bought used 2006 sts v about 45k mi. under hard acceleration the car almost seems to shift multiple times in mid gear. The supercharger winds up then stops and then winds up again. The dealership told me the engine is protected so it is not OVER supercharger????

I have taken off traction control and it does it in automatic and manuel shifting. Any ideas?

WillySTS

· #11 · Apr 1, 2009

JIMMER06STSV said:
under hard acceleration the car almost seems to shift multiple times in mid gear. The supercharger winds up then stops and then winds up again. The dealership told me the engine is protected so it is not OVER supercharger????

Any ideas?

Just so you know...the supercharger does NOT operate independedent of the the engine. When it stops the engine is stopped, when it spins the engine is spinning, they are connected and it does not KICK IN or DISENGAGE.

Now, as for ideas...when I had that happen to me, it was as if it was shifting but was still in one gear(in my case it was 1st or 2nd), it was because the transmission had been serviced and was low on fluid. I had the fluid changed over to Amsoil Universal ATF, and you may or may not know,but, our cars do not have a dipstick to check the fluid level, it has a " fill level plug" in the pan. Turns out it was a little bit short on fluid and under hard acceleration the fuid was moving back in the trans away from the pickupup allowing it to catch air. The car would momentarily not pull,or dis-engage, felt like I may have stepped on the clutch to shift(but no clutch), then the lack of accel(for a few miliseconds) allowed the fluid to resume its position in the pan then would re-engage again...Took me a couple of weeks to figure that out!!! Everybody thought I was crazy

(normal, that is)but after checking the fluid with the car on the rack and running, removing the oil level check plug, pumping oil in it untill it starts to run out,... it was 3/4 quart low. That filled it and fixed it.:bouncy:

Since you just bought your car, they may have serviced the transmission and did not fill it completely....Check it out.

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LITTLEELVISDAN

· #12 · Apr 1, 2009

First, Disconnect your pos battery cable for 30 min. reconnect. If this does not fix it then check for a shifting TSB. BUT I am alost sure what you are feeling is normal for this car. What you may be feeling is the transmission feels like it downshifts or up shifts a half gear so to speak. This is completely normal and is programmed into the transmission. It is a Troque limiting feature, or as we call them a torque nanny. Our car is loaded with them. If they were not there (and I have removed them) you WILL destroy your rear diff. A tune can minimize them for you but you want some kind of limiter on the trans.

I have removed ALL the tq nannies (temporarily to see what would happen) I could find and YES it will shift harder and crisper without the half gear feeling. It will launch harder(if you have slicks). Wheel spin all the way through 1st and partially through 2nd. Downshifts are hard and will break the tail loose. IT WILL DESTROY YOUR DIFF AND OVER TIME RUIN YOUR TRANS...

Our car has a lot more power than what you feel.

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Florian

· #13 · Apr 1, 2009

WillySTS said:
Just so you know...the supercharger does NOT operate independedent of the the engine. When it stops the engine is stopped, when it spins the engine is spinning, they are connected and it does not KICK IN or DISENGAGE

Willy speaks the truth.

F

wait4me

· #14 · Apr 1, 2009

He is probably talking about when the blower bypass valve opens/closes. The blower recirclulates the air back into the inlet of itself when a Vacume is seen on the engine side. He is talking about when you lay into the throttle making the boost valve shut causing the engine to see boost.

LITTLEELVISDAN

· #15 · Apr 1, 2009

It might help to have a common understanding of terms My shot at some

Shudder = pound you fist on the table 4 times fast (violent)
stutter= loss of power intermittently (not violent) ??
Hesitation = a slight pause???

If its a shudder then you got problems a dealer will have to fix.

VforVictory

Discussion Starter · #16 · Apr 1, 2009

Thanks to all that responded.... I have unplugged the D3 ECU box, and the problem still persists. When I have the car in automatic and step on the gas off the line or on a slow roll theres a skipping (Definitely not tires spining or some normal pausing during shifting). This is a studder that has never occured. I have taken off the traction control and the problem still occurs. Oddly this only happens when the car is moving off the line or on a slow roll and I step on it, when in gears 3 and up I can't recreate the problem. Still waiting for Cadillac to call with a remedy. I will keep you guys posted....Thanks

Florian

· #17 · Apr 1, 2009

rear end???

F

LITTLEELVISDAN

· #18 · Apr 1, 2009

Have you reset the ECM? unplug the pos + battery cable for 30 min.

JIMMER06STSV

· #19 · Apr 23, 2009

WillySTS said:
Just so you know...the supercharger does NOT operate independedent of the the engine. When it stops the engine is stopped, when it spins the engine is spinning, they are connected and it does not KICK IN or DISENGAGE.

Now, as for ideas...when I had that happen to me, it was as if it was shifting but was still in one gear(in my case it was 1st or 2nd), it was because the transmission had been serviced and was low on fluid. I had the fluid changed over to Amsoil Universal ATF, and you may or may not know,but, our cars do not have a dipstick to check the fluid level, it has a " fill level plug" in the pan. Turns out it was a little bit short on fluid and under hard acceleration the fuid was moving back in the trans away from the pickupup allowing it to catch air. The car would momentarily not pull,or dis-engage, felt like I may have stepped on the clutch to shift(but no clutch), then the lack of accel(for a few miliseconds) allowed the fluid to resume its position in the pan then would re-engage again...Took me a couple of weeks to figure that out!!! Everybody thought I was crazy(normal, that is)but after checking the fluid with the car on the rack and running, removing the oil level check plug, pumping oil in it untill it starts to run out,... it was 3/4 quart low. That filled it and fixed it.:bouncy:

Since you just bought your car, they may have serviced the transmission and did not fill it completely....Check it out.

Great So I am not crazy! I finally had a tech come in the car with me and agree something is not right. They left me a message today saying they would be checking fluid levels tomorrow so I will keep you posted. God I hope this is what it is.

There is a post that says are car has torque limiters? Is this accurate? I Definately do not believe this is what I am expieriencing no one would ever purchase a perfomance car that performed like mine is right now. As for torque my brother has an e55 amg (my nemesis) and his car has no limiters and more torque hard to believe cadillac would expect to perform in this class if under hard acceleration they have to take the power away from you.

inurok

· #20 · Apr 23, 2009

My car has been doing this since getting the new engine installed. Please keep me posted with any and all solutions.

Chris

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